Background model for the NaI(Tl) crystals in COSINE-100

P. Adhikari, G. Adhikari, E. Barbosa de Souza, N. Carlin, S. Choi, W. Q. Choi, M. Djamal, A. C. Ezeribe, C. Ha, I. S. Hahn, A. J.F. Hubbard, E. J. Jeon, J. H. Jo, H. W. Joo, W. G. Kang, M. Kauer, W. S. Kang, B. H. Kim, H. Kim, H. J. KimK. W. Kim, M. C. Kim, N. Y. Kim, S. K. Kim, Y. D. Kim, Y. H. Kim, V. A. Kudryavtsev, H. S. Lee, J. Lee, J. Y. Lee, M. H. Lee, D. S. Leonard, W. A. Lynch, R. H. Maruyama, F. Mouton, S. L. Olsen, H. K. Park, H. S. Park, J. S. Park, K. S. Park, W. Pettus, H. Prihtiadi, S. Ra, C. Rott, A. Scarff, N. J.C. Spooner, W. G. Thompson, L. Yang, S. H. Yong

Research output: Contribution to journalArticlepeer-review

Abstract

The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2–6) keV energy interval. The dominant contributors in this energy region are found to be 210Pb and 3H.

Original languageEnglish (US)
Article number490
JournalEuropean Physical Journal C
Volume78
Issue number6
DOIs
StatePublished - Jun 1 2018

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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